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function main() {
// Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
const PI = Math.PI;
var s = readLine();
// Print the area of the circle:
console.log(PI*parseFloat(s)*parseFloat(s));
// Print the perimeter of the circle:
console.log(2*PI*parseFloat(s));
try {
// Attempt to redefine the value of constant variable PI
PI = 0;
// Attempt to print the value of PI
console.log(PI);
} catch(error) {
console.error("You correctly declared 'PI' as a constant.");
}
}
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